PNaCl: Update llvm revision in pnacl/COMPONENT_REVISIONS
PNaCl: Update llvm revision in pnacl/COMPONENT_REVISIONS

This pulls in the following LLVM changes:

53e80b9: (jfb@chromium.org) Cherry-pick r243297 from upstream: Fix `llvm-config` to emit the linker flag for the combined shared object built by autoconfig/make instead of the individual components.
00317bd: (dschuff@chromium.org) Auto-sandboxing: Don't expand instructions when in a bundle-locked group
f4f7fe4: (jfb@chromium.org) Facilitate use of `bugpoint` on `-pnacl-sjlj-eh` by adding a hidden option to ignore undefined EH symbols.
d1584e6: (dominickd@google.com) Stop llvm-mc from unconditionally creating CodeEmitter if target is NaCl
df55697: (dominickd@google.com) X86-64 Auto sandboxing memory expansions
30d900c: (jfb@chromium.org) Cherry-pick r243880 from upstream: Refactor AtomicExpand::expandAtomicRMWToCmpXchg into a standalone function.
d34984e: (dominickd@google.com) autosandbox - 64 bit string operations
56c2a63: (jfb@chromium.org) `ExpandLargeIntegers` can't expand returned large ints, so add a check and tests for that.
c4a619f: (jfb@chromium.org) PNaCl: Rewrite @llvm.debugtrap to @llvm.trap.
7d40fe2: (dominickd@google.com) Fixed failing x64 string instruction tests
e65ff04: (dominickd@google.com) auto-sandboxing, fixed x86-64 address mode corner cases
0aee717: (dominickd@google.com) Auto sandboxing: Stack manipulations for x86-64
ebc14bf: (dominickd@google.com) Auto-sandboxing: Fixed bug with XCHG instruction
7150682: (dominickd@google.com) Moved all autosandboxing tests to separate directory
7f5d8a3: (dominickd@google.com) Added plumbing for ARMMCNaClExpander
6c8ef8b: (dominickd@google.com) Auto sandboxing: fixed bug with fp memory operations
0fbe03c: (dominickd@google.com) Auto-sandboxing: x86-64 control flow expansions
8ef7b82: (dominickd@google.com) Auto sandboxing: branches and call for ARM
db0e8a7: (dschuff@chromium.org) Revert "Cherry-pick r243297 from upstream: Fix `llvm-config` to emit the linker flag for the combined shared object built by autoconfig/make instead of the individual components."
3439ee8: (dominickd@google.com) Auto sandboxing: Removed ad-hoc approach to ARM condition codes
cd1a765: (jfb@chromium.org) Cherry-pick r241886 from upstream: [InstCombine] Properly combine metadata when replacing a load with another
9fad30c: (jfb@chromium.org) Cherry-pick r244229 from upstream: Fix an alignment error in `llvm::expandAtomicRMWToCmpXchg` without breaking the build where X86 isn't enabled.
53904b2: (dominickd@google.com) Added flag for auto sandboxing

BUG=none
TEST= PNaCl toolchain trybots
R=kschimpf@google.com

Review URL: https://codereview.chromium.org/1274933006 .

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client